Trusted Sunroom Builders Nationwide
A sunroom changes how a house feels. Morning light moves across a room that used to be a dark patio, and the family finally has a place to sit that is not the kitchen table. The builder you hire decides how that goes: what is protected inside your home during construction, what the price looks like in writing before tools arrive, and what the crew leaves behind at the end of each day. Seedling ADU Builders has been building since 2001, and we build sunrooms, home additions, garage conversions, and ADUs with a written price before any work starts and a 365-Day Done Right Promise on every completed job. If it’s not done right, we make it right. Call (707) 383-5338 to talk with a live person about your project, any hour, any day. Not sure which type of space fits your lot? Start with our home page or read about our room addition contractor work.
What a Sunroom Build Includes
A sunroom is a room with a lot of glass, built to bring in daylight and a view without the cold, heat, or bugs of an open patio. Done properly it is a real part of the house: a foundation or slab, framed walls, a roof that ties into the existing structure, windows or glass panels, electrical, and finishes. Families choose a sunroom for a reading room, a breakfast nook, a play space, a plant room, or a quiet spot for a parent who spends most of the day at home. Seedling ADU Builders handles the entire project with background-checked, uniformed technicians and a written price delivered before any tool is picked up. Depending on size, glass package, and how the new room connects to your home, a sunroom typically runs $25,000 to $90,000. You will know your number before you commit, with no surprise line items added later.
Site Work and Foundation
Sunrooms are heavy on glass, and glass does not forgive a shifting base. We check the soil, the grade, and any drainage that runs along the wall you plan to build against before concrete goes in. If you already have a patio slab, we test whether it can carry the new walls or whether it has to come out. Skipping that step is how families end up with cracked glass and sticking doors three winters later.
Tying Into the Existing House
The wall where the sunroom meets your home is where most problems start. Flashing, roof tie-ins, and the opening cut into the old wall all have to be done right the first time. We protect the floors inside your house with drop cloths and shoe covers, hang dust barriers over the opening, and photograph the clean-up before we leave each day.
Three-Season and Four-Season Sunrooms
The first question we ask is how you plan to use the room. A three-season sunroom is built with lighter walls and single or basic double-pane glass. It is comfortable in spring, summer, and fall, and it costs less. A four-season sunroom is built like the rest of the house, with insulated walls, an insulated roof, energy-rated glass, and heating and cooling tied into the home. It can be used on a January morning or a July afternoon.
Picking the Right Type for Your Climate
A three-season room that works well in a mild climate can be miserable in a place with hard winters. We tell you honestly which type fits where you live and how you will use the room. If you want a space you will actually sit in every day of the year, we will usually steer you toward four-season construction, and the written price will show the difference so you can decide.
Glass, Heat, and Comfort
Too much unshaded glass on a west wall turns a sunroom into an oven by two in the afternoon. We talk through glass coatings, roof glazing, overhangs, and shades before the order is placed. Low-E glass, insulated roof panels, and ceiling fans cost real money, but they are what keep the room usable instead of just pretty.
Sunroom Styles We Build
Not every house wants the same sunroom. A low ranch often suits a shed-roof room off the back. A two-story home may look better with a gabled roof that matches the main house. Some families want a glass-heavy conservatory look, and others want mostly solid walls with large windows. Our design conversation starts with the house you already have, not a catalog photo.
Attached Sunrooms
Most of our sunroom projects are attached to the rear or side of the house, with a door from the kitchen, dining room, or family room. An attached room shares the home’s heating and cooling, so it is easy to use all year. It also adds the most value, because buyers count it as living space when it is built and permitted properly.
Sunrooms Over a Deck or Patio
If you already have a good deck or patio, enclosing it can save money. The catch is that old decks were rarely built to carry walls and a roof. We inspect the framing, footings, and ledger connection first, and we tell you in writing whether the structure can be reused or has to be rebuilt.
Prefab and Kit Sunrooms
Factory-built sunroom kits can shorten the on-site schedule, and they work well on simple lots. The kit is only part of the job, though. Someone still has to prepare the base, set the frame, flash it into the house, run the power, and finish the inside. Our crews handle all of that so the whole room is covered by one price and one promise.
Permits, Codes, and Inspections
Many families assume a sunroom does not need a permit because it is mostly glass. In most places it does. A room that is attached to the house and has a roof, a floor, and power is almost always treated as an addition. Setbacks, height limits, energy rules, and window safety glass requirements all come into play, and the rules change from one jurisdiction to the next.
We Pull the Permits
Seedling prepares the submittal, answers plan-check questions, and schedules each inspection. Nothing gets covered up until it passes. Unpermitted work can cause trouble when you sell, refinance, or file an insurance claim, and we would rather spend a few extra days on paperwork than leave you with that problem.
Lot Lines and HOA Rules
If your neighborhood has a homeowners association, check its exterior rules before you sign anything. We help gather the drawings and material samples the association asks for, and we flag any setback issue on your lot at the walk-through, not after the foundation is poured.
Sunroom Versus Other Home Additions
A sunroom is one of several ways to add space. If you need a bedroom, a bath, or a place for a family member to live, a different project may fit better. A standard room addition costs more per square foot than a sunroom but gives you a fully enclosed, private space. A second story can add a lot of space without using any of your yard. A detached accessory dwelling unit can house a parent or produce rental income. You can read more about those options on our ADU builders, ADU construction, and second story addition contractor pages.
The right answer depends on your lot, your budget, and what the space has to do. We would rather tell you that a different project fits better than sell you a sunroom that will sit empty. That honesty is part of why families call us again for the next project.
Keeping Your Home Livable During Construction
A sunroom project puts a crew in your yard and a hole in your wall for a couple of months. How the crew behaves in that time matters as much as the finished room. The Cedarwell Care Promise applies on every visit: shoe covers and drop cloths inside your home, pet-safe products where there is a choice, quiet tools near bedrooms where we can, and a photo of the clean-up before we leave. Kids and pets stay safe because we fence the work area and keep materials contained, and your crew is introduced before they start working near your family.
Signs You Need a Pro Right Now
- Your patio is unused most of the year. Too hot in summer, too cold in winter, or buggy at dusk. Enclosing it with a properly built sunroom turns wasted square footage into a room the family uses daily.
- You have an old screen porch with soft wood or a sagging roof. Rot in the ledger board or posts is a safety problem. A builder can tell you whether to repair the structure or replace it before adding glass.
- Your kitchen or living room feels dark. A sunroom off that room can bring daylight deep into the house without a major remodel of the interior.
- You were quoted a sunroom kit price that did not include site work. Kit prices usually leave out foundation, electrical, permits, and finish work. A written price for the whole project shows what the room really costs.
- You want one company accountable for the whole build. When the designer, the foundation contractor, and the glass installer are all separate, blame gets passed around. One builder with a written price and a written promise means one phone call if anything is not right.
Our Process, Step by Step
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Call and talk with a live person. You reach a person at (707) 383-5338, not a voicemail tree. We ask about your house, how you want to use the room, and your budget range, then set up a walk-through if the project seems like a fit.
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Site walk-through and honest assessment. We look at the wall where the sunroom will attach, the ground, the sun angles, and any existing patio or deck. You will hear what works and what does not, with specific reasons.
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Written price and scope. Before any construction starts, you receive a written price covering the scope we discussed. There are no surprise line items added after crews arrive, and the estimate is free.
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Permits, foundation, and construction. We pull permits, protect the interior of your home with drop cloths and shoe covers, and keep you updated as the build progresses. The Cedarwell Care Promise applies on every visit.
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Final walk-through and 365-Day Done Right Promise. We walk the finished room with you, address any items, and hand over the written 365-Day Done Right Promise. If it is not done right within the first year, we make it right.
How Much Do Sunroom Builders Cost?
A basic three-season sunroom on an existing slab typically runs $25,000 to $50,000. A fully insulated four-season sunroom built on a new foundation usually lands between $50,000 and $90,000, depending on square footage, glass package, roof style, and how much electrical and HVAC work is needed. A large custom room with high-end finishes can exceed that, and we will tell you if your project is heading that way before you spend a dollar on construction.
What moves the price most: three-season or four-season construction, whether a usable slab already exists, the roof style, the amount of glass and its energy rating, and how the new room ties into your heating and cooling. Kit sunrooms can lower the material cost, but foundation, permits, and finish work still cost real money. The best way to avoid overpaying is to get a written, fixed scope before work starts, and to choose a builder who does not add change orders after the fact. A free estimate from Seedling includes a walk-through and a written price, so you know your number before you commit. Call (707) 383-5338 to schedule yours.
Where We Work
Seedling ADU Builders serves homeowners across the United States through local crews who understand the housing stock, soil, and weather conditions in their area. Wherever your home is, the same written pricing, the same 365-Day Done Right Promise, and the same Cedarwell Care Promise apply. Call (707) 383-5338 and a live person will connect you with the crew who covers your area.
Frequently Asked Questions About Sunroom Builders
Sunroom builders design and construct glass-heavy rooms that attach to your home. A full-service builder handles the foundation, framing, roof, glass, electrical, permits, and finishes under one written price. Seedling ADU Builders has done this work since 2001 and backs every completed job with a 365-Day Done Right Promise.
A three-season sunroom usually costs $25,000 to $50,000, and a four-season sunroom built on a new foundation usually costs $50,000 to $90,000. Size, glass, roof style, and the heating and cooling connection change the number. Call (707) 383-5338 for a free estimate and a written price for your house.
In most places, yes. A sunroom attached to your house with a roof, a floor, and power is normally treated as an addition. We prepare the permit package, answer plan-check questions, and schedule every inspection, so you do not have to deal with the permit office yourself.
A three-season room has lighter walls and basic glass, so it is comfortable in spring, summer, and fall. A four-season room has insulated walls and roof, energy-rated glass, and heating and cooling, so you can use it all year. The right choice depends on your climate and how often you plan to sit in the room.
Construction itself often takes four to ten weeks once permits are approved, depending on size and whether a foundation is needed. Permit timing varies by jurisdiction. We give you a realistic schedule in writing before work begins and keep you informed as the project moves.
Every sunroom, addition, and ADU Seedling builds is covered by the 365-Day Done Right Promise in writing. If it is not done right within the first year, we make it right. You also receive the Cedarwell Care Promise during the build: shoe covers and drop cloths inside your home, pet-safe products where there is a choice, and a photo of the clean-up before the crew leaves each day.
Schedule Your Sunroom Builders Service Today
A brighter home starts with one phone call. Call (707) 383-5338 to talk with a live person about your sunroom, home addition, or garage conversion. You will get a free, no-obligation estimate with a written price before any work starts, and every job is backed by the 365-Day Done Right Promise. We answer 24/7, so call whenever it works for your family.
Written by Ben Ortega, Owner at Seedling ADU Builders.